Phaser 3320, bitmap images are not printing in high resolution

I am printing a scanned page in black and white (only K has value). However, regardless the setting of High quality, Low quality, postscript setup etc. it all come up fuzzy. Please find the following comparison with HP laserjet, I tested on a rocoh printer as well, the result is similar. Tested on different software as well, from preview to photoshop. all the same.

All the vetor files and fonts are printing suprbly, hence I suspect there must be a setup/driver problem.

My setup is:

Printing via wifi.

OS: Mac OS X 10.9.1

Driver Version: 5.00

System: Phaser3320_V53.002.05.000 AUG-22-2012

PS. just did a firewire upgrade: Phaser3320_V53.004.02.000 JAN-03-2014